Transmission Claw Elastic Support for Ratchet Fatigue
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Solution Overview
Problem
Existing driving force transmission mechanisms, such as ratchet mechanisms, face inefficiencies in transmitting rotational force due to bending deformation, which can lead to fatigue fractures and reduced torque transmission capabilities, especially when handling high rotation torques.
Innovation Solution
A driving force transmission mechanism featuring a first transmission member with transmission claws and a second transmission member with stoppers and holding portions, where the transmission claws are designed to engage with the stoppers and holding portions, allowing efficient one-directional force transmission by minimizing bending deformation through elastic support and secure engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ratchet mechanism with a ratchet portion engaging a stop surface is used to transmit rotational force in one direction, then the conveyance rollers can freely rotate in the conveyance direction even when the motor stops, but the ratchet portion bends and deforms during engagement, reducing transmission efficiency and potentially causing fatigue fracture
Solution Approach 1:
The ratchet portion is divided into two separate functional elements: a transmission claw for engaging the stopper to transmit driving force, and an elastic member that provides resilient support. This segmentation allows each component to be optimized for its specific function, preventing the transmission element from bearing bending loads.
Solution Approach 2:
An elastic member is introduced as an intermediary between the transmission claw and the ratchet wheel body. This elastic member absorbs and cushions the bending forces that occur during engagement, protecting the transmission claw from fatigue while maintaining the one-directional force transmission function.
2Reliability
If the ratchet portion is designed to engage the stop surface for force transmission, then one-directional rotation control is achieved, but bending deformation occurs during engagement which reduces rotational force transmission efficiency
Solution Approach 1:
The ratchet mechanism is segmented into distinct functional components: the transmission claw handles force transmission engagement, while the elastic member separately handles the cushioning of bending deformation. This allows the transmission claw to engage efficiently without energy loss to deformation.
Solution Approach 2:
The elastic modulus and geometric parameters of the elastic member are optimized to provide sufficient resilience for cushioning engagement forces while minimizing energy storage in deformation. This parameter optimization ensures efficient force transmission with minimal energy loss.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables reliable and efficient transmission of rotational force with reduced risk of fatigue fractures, allowing for greater torque handling and stable operation, even under high load conditions.
Implementation Method 1
the transmission claw includes, at a position away from the rotational center axis, a fixing portion with respect to the first transmission member, and extends in a direction crossing a direction directed from the fixing portion to the rotational center axis
Data Source
AI summary
A driving force transmission mechanism includes a first transmission member and a second transmission member that are arranged on an identical rotational center axis. The first transmission member includes one or more transmission claws engaged with the second transmission member. The transmission claw includes, at a position away from the rotational center axis, a fixing portion with respect to the first transmission member, and extends in a direction crossing a direction directed from the fixing portion to the rotational center axis. The second transmission member includes one or more stoppers engaged with a tip end of the transmission claw and one or more holding portions engaged with a side of the transmission claw, which faces the rotational center axis.